Governor for engine safety stops



Oct. 5 1926. 1,602,082

E. A. MALMGREN GOVERNOR FOR ENGINE SAFETY STOPS Fil'ed March 1. 1926 2 sheets sheet 1 m/MM Oct. 5,1926. 7

' E. A. MALMGREN GOVERNOR FOR ENGINE SAFETY STOPS- Filed March 1. 1926 2 Sheets-Sheet 2 zumewfrom the left of'Figure 2; 1 V

Figure 5 fis.a-v1ew.o=fthegovernoras seen I Patented Oct. 5, 1926.

"UNITED .s; TAT-Es 1,602,082 PATENT oFFicE.

EDWARD A. MAI MG-REN, OF DULUTH, MINNESOTA.

GOVERNOR FOR ENGINE SAFETY STOPS.

Application filed March 1, .1926. Serial v1N0. 91,557.

a This invention relates to a new and improved governor forengine safety stops and more particularly, to a governor of this character which is adapted to positively operate the stop. mechanism.

It is a further object to provide construction of this characterwhich is adapted to be adjusted to operate at selected speeds.

ltais an'additional object to provide construction in which spring means are provided for accelerating the V movement to stop position after the mechanism has been released from normal position.

Other and further objects will appear as the description proceeds.

1 have illustrated a preferred embodiment I of my invention in the accompanying drawings, in -which, V

Figure 1 shows the invention applied to an engine; 1 j

Figure 2 is a view of the governor on an enlarged scale;

Figure 31s a vlew taken=on 11116 33 of.

Figure 2;

Figure 4 is a view of %the governor as-seen from the right of F igure2 and Figure 6 is a-section-takenon line 66 .of

Figure 2.

Referring first to Figure 1, the governor 11 is-shown-as applied ito the-cross head 12 of the reciprocating. engine 13. The steam supply to the engine is controlled by the hand valve 14 and by an automatic valve pivoted to shaft 15 and adapted to be closed by the weight 16. The governor is adapted in its stop position toengage the arm 17 on the lever 18 and to thrust it to the left. The upper end of the lever 18 is connected by rod 19 with the bell crank 20, the opposite arm of which is provided with a lug 21 engaging the arm 22 connected to the valve shaft 15.

The governor is shown more in detail in Figures 2 to 6. It comprises the base plate engine is operating at normal speed.

23 adapted to be bolted to the cross head as shownin Figure 1. Itmay be bolted to any reciprocating member of the engine. The weighted arm 24: is' pivoted to the stud 25 carried by the base 23 and is retained upon the stud by the washer 26 and key 27 The arm 24 carries at its upper endthe weight 28. The stop arm 29 is pivoted upon the study 30 carried by the base 23 and is retained in place by the washer 31 and key 32. The arm 29 extends through a slot 33 in the weighted'arm 24 as clearly shown in The members 34 are riveted to the upper portion of the arm 29 and are F lgure 5.

adapted toengage the shoulders 35 of the weighted arm 24 when the parts are in normal position, as shown in Figure 2.

The slide 36 is fitted in the slot 42 formedv in the stop member 29, the slide consisting of two members held together by the bolts 37, as clearly shown in Figure 6. One end of the spring 38 is secured to the slide 36 and the opposite end is hooked around the pin 39 extending through the slot in the weighted arm 24. The'slide 36 is threaded upon the adjusting stud 40 carried by the stop arm 29 andbyv means of this stud the slide may be moved backand forth to vary the tensionon the spring 38.

In the operation of the device, when the cross headil2 is reciprocated in the movement-of the engine, the inertla of the weight 28 tends to carry it on to the: rightwhen the cross head stops and starts its movement to the left. This inertia is overcome by the strength of the spring 38 when the The weighted arm is'thus held-so that the mem bers 34 remain upon the shoulder 35 and the stop arm is held in normal position. In the normal position, as the cross head reaches its limit of movement toward the lever 18, the lug 41 on the-end of'the stop arm passes above the portion 17 of the lever 18.

When the speed of the engine exceeds the normal by a predetermined amount, the inertia of the weight 28 is sufficient to carry it to the right an amount such that the members 34 clear the shoulder '35. This position is indicated in broken lines in Figure 2. The stop arm 29 then drops under the combined force of gravity and spring 38, both forces acting simultaneously and continuously until arm 29 reaches its downward limit,as shown in broken lines in Figure 2. This movement is limited by the lower end of the slot 33 in the weight arm 24.

With the parts in this position, as the cross head reaches its left limit of movement, the lug 4:1 engages the lever arm 17 and thrusts the lower end of the lever 18 to the left. The upper end of the lever moves to the right and by means of the rod 19 swings the bell crank lever 20 in the clockwise direction about its pivot. This serves to unlatch the arm 22 and the weight 16 drops closing the valve and cutting off the steam to the engine. To start the engine, the stop arm 29 must be raised until the members 34 catch on the shoulder 35 and the valve must be opened by raising the weight 16 until the latch 21 engages the arm 22.

It will be noted that the mechanism is not dependent for its operation upon the action of the weight directly upon the valve, but that this movement of the weight merely releases the stop member which stop member positively actuates the valve closing mechanism. The stop member not only drops by gravity, but is pulled down by the spring. The apparatus is, therefore, certain and positive in its operation.

While I have shown one preferred form by way of illustration, my invention is capable of modification to meet varying conditions and I contemplate such changes and modifications as come within the spirit and scope of the accompanying claims.

I claim:

1. In a governor for engine safety steps, a base secured to a reciprocating portion of the engine, a contact member and a weighted member each pivotally secured to the base, the weighted member normally engaging the contact member to maintain it in inoperative position and being adapted to be actuated by inertia to release the contact member.

2. In a governor for engine safety stops, a base secured to a reciprocating portion of the engine, a contact member and a weighted member each pivotally secured to the base, the weighted member having a slot formed therein and the contact member extending through the slot, the contact member having a portion normally resting on a shoulder of the weighted member to maintain the contact member in inoperative position.

3. In a governor for engine safety stops, a base secured to a reciprocating portion of the engine, a contact member and a weighted member each pivotally secured to the base, the weighted member having a slot formed therein and the contact member extending through the slot, the contact member having a portion normally resting on a shoulder of the weighted member to maintain the contact member in inoperative position, and a spring having one end secured to the contact member and the other end to the weighted member to maintain the parts in normal position.

4. In a governor for engine safety stops, a base secured to a reciprocating portion of the engine, a contact member and a weighted member each pivotally secured to the base, the weighted member having a slot formed therein and the contact member extending through the slot, the contact member having a portion normally resting on a shoulder of the weighted member to maintain the con tact member in inoperative position, and a spring having one end secured to-a yoke movable on the contact member and the other end to the weighted member tomaintain the parts in normal position, and means to move the yoke to vary the tension of the spring.

5. In a governor for engine safety stops, a base secured to a reciprocating portion of the engine, a contact member and a weighted member each pivotally secured to the base, the weighted member having a slot formed therein and the contact member extending through the slot, the contact member having a portion normally resting on a shoulder of the weighted member to maintain the contact member in inoperative position, and a spring having one end secured to the contact member and the other end .to the weighted member to maintain the parts in normal position, the spring being so related to the contact and weighted members that when the contact member is released the power of the spring and gravity assist in moving them from normal to stop position;

Signed at Duluth, Minnesota, this 23rd day of February, 1926.

EDWARD A. MALMGREN. 

